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Dear Mr. DeRoche,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog but did not locate any records available as images online from Louisiana. Therefore, we searched on Ancestry and located Hellier DeRoche and family in the 1910, 1920 and 1930 Census. We located a Hellier DeRoche and a Florence Green DeRoche on Find A Grave. We also located a Florence Green in the 1900 Census living with her widowed father Chas [Charles] Green and brother John. To view these records on Ancestry, there may be a fee. Or you may view these records online at one NARA's facilities for free via ALIC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Also, some of the images from Ancestry are available for free on Family Search at https://www.familysearch.org/en/.
We hope this is helpful. Best of luck on your family research!